<?php

/**
 * An argument handler for use in fields that have a many to one relationship
 * with the table(s) to the left. This adds a bunch of options that are
 * reasonably common with this type of relationship.
 * Definition terms:
 * - numeric: If true, the field will be considered numeric. Probably should
 *   always be set TRUE as views_handler_argument_string has many to one
 *   capabilities.
 * - zero is null: If true, a 0 will be handled as empty, so for example 
 *   a default argument can be provided or a summary can be shown.
 *
 * @ingroup views_argument_handlers
 */
class views_handler_argument_many_to_one extends views_handler_argument {

    function init(&$view, &$options) {
        parent::init($view, $options);
        $this->helper = new views_many_to_one_helper($this);

        // Ensure defaults for these, during summaries and stuff:
        $this->operator = 'or';
        $this->value = array();
    }

    function option_definition() {
        $options = parent::option_definition();

        if (!empty($this->definition['numeric'])) {
            $options['break_phrase'] = array('default' => FALSE);
        }

        $options['add_table'] = array('default' => FALSE);
        $options['require_value'] = array('default' => FALSE);

        views_many_to_one_helper::option_definition($options);
        return $options;
    }

    function options_form(&$form, &$form_state) {
        parent::options_form($form, $form_state);

        // allow + for or, , for and
        if (!empty($this->definition['numeric'])) {
            $form['break_phrase'] = array(
                '#type' => 'checkbox',
                '#title' => t('Allow multiple terms per argument.'),
                '#description' => t('If selected, users can enter multiple arguments in the form of 1+2+3 (for OR) or 1,2,3 (for AND).'),
                '#default_value' => !empty($this->options['break_phrase']),
            );
        }

        $form['add_table'] = array(
            '#type' => 'checkbox',
            '#title' => t('Allow multiple arguments to work together.'),
            '#description' => t('If selected, multiple instances of this argument can work together, as though multiple terms were supplied to the same argument. This setting is not compatible with the "Reduce duplicates" setting.'),
            '#default_value' => !empty($this->options['add_table']),
        );

        $form['require_value'] = array(
            '#type' => 'checkbox',
            '#title' => t('Do not display items with no value in summary'),
            '#default_value' => !empty($this->options['require_value']),
        );

        $this->helper->options_form($form, $form_state);
    }

    /**
     * Override ensure_my_table so we can control how this joins in.
     * The operator actually has influence over joining.
     */
    function ensure_my_table() {
        $this->helper->ensure_my_table();
    }

    function query() {
        $empty = FALSE;
        if (isset($this->definition['zero is null']) && $this->definition['zero is null']) {
            if (empty($this->argument)) {
                $empty = TRUE;
            }
        } else {
            if (!isset($this->argument)) {
                $empty = TRUE;
            }
        }
        if ($empty) {
            parent::ensure_my_table();
            $this->query->add_where(0, "$this->table_alias.$this->real_field IS NULL");
            return;
        }

        if (!empty($this->options['break_phrase'])) {
            views_break_phrase($this->argument, $this);
        } else {
            $this->value = array($this->argument);
            $this->operator = 'or';
        }

        $this->helper->add_filter();
    }

    function title() {
        if (!$this->argument) {
            return !empty($this->definition['empty field name']) ? $this->definition['empty field name'] : t('Uncategorized');
        }

        if (!empty($this->options['break_phrase'])) {
            views_break_phrase($this->argument, $this);
        } else {
            $this->value = array($this->argument);
            $this->operator = 'or';
        }

        // @todo -- both of these should check definition for alternate keywords.

        if (empty($this->value)) {
            return !empty($this->definition['empty field name']) ? $this->definition['empty field name'] : t('Uncategorized');
        }

        if ($this->value === array(-1)) {
            return !empty($this->definition['invalid input']) ? $this->definition['invalid input'] : t('Invalid input');
        }

        return implode($this->operator == 'or' ? ' + ' : ', ', $this->title_query());
    }

    function summary_query() {
        $field = $this->table . '.' . $this->field;
        $join = $this->get_join();

        if (!empty($this->options['require_value'])) {
            $join->type = 'INNER';
        }

        if (empty($this->options['add_table']) || empty($this->view->many_to_one_tables[$field])) {
            $this->table_alias = $this->query->ensure_table($this->table, $this->relationship, $join);
        } else {
            $this->table_alias = $this->helper->summary_join();
        }

        // Add the field.
        $this->base_alias = $this->query->add_field($this->table_alias, $this->real_field);

        $this->summary_name_field();

        return $this->summary_basics();
    }

    function summary_argument($data) {
        $value = $data->{$this->base_alias};
        if (empty($value)) {
            $value = 0;
        }

        return $value;
    }

    /**
     * Override for specific title lookups.
     */
    function title_query() {
        return $this->value;
    }

}

